I have spent most of the last few years in a rural area, yeah. Spent a few months in a tourist trap, and have spent the last 6 months in a small city. And, yes, ODD is oppositional defiant disorder. Honestly they could've easily gone with ADHD instead. Or both, because DTD (developmental trauma disorder) isn't a thing (yet). But that doesn't really matter anymore because screw childhood.
Your story sounds awful. And from your other posts (including this one) it sounds like you've searched quite a bit around the 95 corridor in Maryland and Pennsylvania. You ever go to NJ? I hear they have some of the best mental health treatment in the country.